All standard resistor values can be found in the table below. In the table below the values for each code is given, which are basically the values. Standard series values in a decade for resistances and capacitances e3 to e192 according to iec 60063 e192 e96 e48 e192 e96 e48 e192 e96 e48 e192 e96 e48 e24 e12 e6 e3 100 100 100 178 178. Following this logic, the preferred values for 10% tolerance resistors between 100 and 1,000 ohms would be 100, 120, 150, 180, 220, 270, 330 and so on rounded appropriately. Eia standard resistor values by tolerance% move the decimal point to achieve the actual value desired. E192 less than 1% tolerance, used only where great accuracy is important. Decoding resistor color bands when decoding the resistor color bands, consult a resistor color code table like the one below.
The 120 ohm resistor has a value ranging between 110 and ohms. The excel cell formula below calculates the nearest standard 1% resistor value without using a lookup table or macro. Excel formula calculates standard 1%resistor values. Dec, 2017 standard resistor values electronics basictables an introduction to electronics 2 4 colour coding and most common resistor values solved table j 1 standard resistance values resistor v share this. Resistors are available with ratings from a fraction of an ohm to millions of ohms, but they come in standard values only. Standard electronic decade value tables decade table vishay dale document number 31001 for technical questions, contact.
The second calculator gives a more accurate value using these figures, which can be found in the suppliers catalogue. Riedon is a manufacturer of power resistors, shunt resistors and has view equivalents. Electronics assistant includes all these calculators and more in a standalone windows application. The number following the e specifies the number of logarithmic steps per decade. Standard eia decade values table e6 e12 e24 e48 e96 e192. How to memorize the standard resistor values quora.
Use the resistor color code chart below to understand how to use the color code system. The two first numbers represent a code that indicates a resistance value with three significant digits. This specification may be changed at any time without prior notice. Determination of a resistor s value according to its colors, determination of a resistor s color accordng to its value, determination of a resistor s standard according to its value, support for resistors with from 3 to 6 bands, color code table that includes decoding example, eia standard value table e6, e12, e24, e48, e96, e192.
E24 e48 e96 and e192 resistor values riedon company blog appendix d standard composition resistor values complete an introduction to electronics 2 4 colour coding and. Revision 04oct06 335 standard resistance values are obtained from the decade table by multiplying by powers of 10. Standard series values in a decade for resistances and capacitances e3 to e192 according to iec 60063 e192 e96 e48 e192 e96 e48 e192 e96 e48 e192 e96 e48 e24 e12 e6 e3 100 100 100 178 178 178 316 316 316 562 562 562 10 10 10 10 101 180 320 569 11 102 102 182 182 324 324 576 576 12 12. Type or electronically paste the text below into any cell other than a1. Standard series values in a decade for resistances and. Successive values within a decade series are related approximately by a factor of for the e12 series, for the e24 series, for the e96 series and for the e192 series. But i remember the most common values simply through constant exposure. It makes little sense to produce a 105 ohm resistor since 105 ohms falls within the 10% tolerance range of the 100 ohm resistor. Power rating depends on the resistors construction. When manufacturers produce resistors with different resistance values, these end up approximately equally spaced on a logarithmic scale. If there is no tolerance band, then find the side that has.
For the first two bands, find that colors corresponding digit. In this system, the marking exists out of three digits. These values are among the most common resistor values. These values are generally available in multiples of 0. Resistor color code system how to read the resistor code. The number after the e denotes the number of values the series contains per decade. These are referred to as preferred values or eseries, and they are published in standard iec 60063. Standard eia decade resistor values table e6 e12 e24. Resistor color code chart resistors are devices that limit current flow and provide a voltage drop in electrical circuits. Standard resistance values for the 10 to 100 decade also usable in decade multiples or submultiples e192 e96 e24 e12 e6 e192 e96 e24 e12 e6 e192 e96 e24 e12 e6 e192 e96 e24 e12 e6 e192 e96 e24 e12 e6 0.
The e series is a system of preferred numbers also called preferred values derived for use in electronic components. When looking at the chart, note the illustration of three round resistors with numerous color code bands. Special e192 resistance values are now supported on all case sizes of ntr series of. Using 10% tolerance devices as an example, suppose that the first preferred value is 100 ohms. They are the standard e3, e6, e12, e24, e48 and e96 resistor values. Selecting resistor values traditionally has been a manual process where the calculated value is matched to a real value. The electronic industries association eia, and other authorities, specify standard values for resistors, sometimes referred to as the preferred value system. If you like it please feel free to a small amount of money to secure the future of this. Round the results to the proper number of significant figures 3 for 1% and 2%, 2 for 5% and 10%. The eight official e24 values shown in bold do not exist in the e48, e92, e192 series. E192 resistors datasheet, cross reference, circuit and application notes in pdf format. The tolerance of a resistor is the difference between the preferred value i. Using standard resistor values can greatly impact the accuracy and predictability of a circuit by eliminating rounding errors incurred at the end of the design. A larger physical size indicates a higher power rating.
Following this logic, the preferred values for 10% tolerance resistors between 100 and 1,000 ohms would be 100, 120, 150, 180, 220, 270. Resistors are available in a number of standard ranges, often called preferred values these ranges, or series, are set out by the electronic industries association eia, and are e3, e6, e12, e24, e48, e96 and e192. This table shows all possible values for the 4 most common e ranges on a range from 1 00 to. Nov 23, 2012 this graph shows all the standard resistor values which occur in the e12 series. If you like it please feel free to a small amount of money to secure the future of this website. It consists of the e3, e6, e12, e24, e48, e96 and e192 series, where the number after the e designates the quantity of value steps in each series. This helps the supplier to limit the number of different values. Physical resistor components will vary from the ideal due to fabrication variability, resistor.
Resistor color code system resistor color coding system applies to carbon film resistors, metal oxide film resistors, fusible resistors, precision metal film resistors, and wirewound resistors. The bigger the value of a resistor the more it opposes the current flow. Jan 02, 20 using standard resistor values can greatly impact the accuracy and predictability of a circuit by eliminating rounding errors incurred at the end of the design. Standard resistance value is obtained from the above chart by multiplying by powers of 10. Occasionally e24, e48, e96 or even e192 series values may needed for high accuracy and close tolerance requirements. The cost of running this website is covered by advertisements. In 1952 the iec international electrotechnical commission decided to define the resistance and tolerance values into a norm, to ease the mass manufacturing of resistors.
Determination of a resistor s value according to its colors, determination of a resistor s color accordng to its value, determination of a resistor s standard according to its value, support for resistors with from 3 to 6 bands, color code table that includes decoding example, eia standard value table e6, e12, e24, e48, e96, e192, resistor. Eseries values standard series values in a decade for. The preferred value system has its origins in the early years of the last century at a time when most resistors were carbongraphite with. Use this utility to find the optimum set of resistors for a circuit of resistors from the resistor sequence. Decade scaling for more resistor values and the bs 1852 notation system for. That is, resistors are not available for every possible ohmic roundnumber value. The rationale is simple select values for components based on the tolerances with which they are able to be manufactured. The use of color bands on the body of a resistor is the most common system for indicating the value of a resistor. Power rating of resistors in addition to having the required ohms value, a resistor should have a wattage rating high enough to dissipate the power produced by the current without becoming too hot. Precision metal film resistors precision power resistors.
Table 2 lists the standard values of primary interest to amateurs. The eia standard values for e12, e24, e96, e192, can be found on every resistor manufacturers web site. These tiny chips are marked with three 3 or four 4 digit codes which is called smd resistor codes to indicate their resistance values. A free online environment where users can create, edit, and share electrical schematics, or convert between popular file formats like eagle, altium, and orcad. Preferred resistor values the eia e series specify the preferred values for various tolerances. The first resistor in the chart with 4 bands tells you the minimum information you can learn from a resistor. Generally these temperature coefficient values are extremely small, in the ppm range. The ra is resistance to place in parallel and in series of two resistors to create a non standard resistance. The chart also gives you an example of the color codes used for the different values. The tolerance band on a resistor indicates the spread of possible values of any particular resistor, for example a resistor marked as 47k. The power rating may be as low as 110 watts and can be in several hundred watts. Only approximate values of resistance can be had by this method. The e series of preferred numbers were chosen such that when a component is manufactured it will end up in a range of roughly equally spaced values on a logarithmic scale. Youll find the values for the e6, e12, e24, e48, e96 and e192 series or preferred resistor values in this table.
The standardization of resistor values serves several important purposes. A higher number correlates to a lower tolerance and a higher precision. Standard resistor values are calculated using the simple formula given below. Two decades of e12 values, which would give resistor values of 1. This calculator will select the closest standard resistor value, from 1% 5% or 10% standard eia values, calculates the error, and prints out a table of the standard values. Selecting resistor values traditionally has been a manual process where the calculated value is matched to a real value in a printed lookup table. The completed wire wound resistor is coated with an insulating material such as baked enamel.
These all vary in range and type of application a particular resistor. This tool find the optimum set of resistors r1,r2 and r3,r4 for a desired ra value. As the chart at the right shows created in excel, plotting the values on a logarithmic scale results in a straight line. Youll find the values for the e6, e12, e24, e48, e96 and e192 series or preferred resistor values. Find the resistor you need by visiting our website today. The number after the e denotes the number of values. The resistance of resistors often follows the e series. For e48 to e192, the values are rounded to 2 trailing digits. Each e series subdivides each decade magnitude into steps of 3, 6, 12, 24, 48, 96, 192 values.
Kitronik ltd how to calculate and understand resistor values resistors a resistor is a device that opposes the flow of electrical current. The e series consists of the e3, e6, e12, e24, e48, e96 and e192 series. Eia standard resistor values stackpole electronics, inc. This page is a web application that design circuits of resistors.
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